Flameproof Vs. Explosion-proof: What's The Difference?
Differences between flameproof and explosion-proof enclosures
As you can see, the differences between the two are subtle at first glance. As such, it is unsurprising to learn that flameproof and explosion-proof are terms often used interchangeably.
However, as you explore further, you will discover that the primary distinction between the two is their certification systems. The term “flameproof” applies to the international certification system (IEC). Meanwhile, “explosion-proof” is the North American standard. So how does this distinction impact both types of enclosures? Read on to find out.
Difference #1: Specification protocol
Both flameproof and explosion-proof enclosures follow different protocols. The latter adheres to the NEC protocol. Meanwhile, flameproof equipment, like flameproof light fixtures, is covered by the IEC protocol. As such, flameproofing systems are used in Europe, while explosion-proofing is more common in North America.
Difference #2: Testing parameters
Given that both types of enclosures follow different protocols, it is only natural that they have distinct testing parameters. Explosure-proof enclosures are tested to ensure they can withstand up to 4 times the gas explosion pressure. In contrast, flameproof systems are usually tested for overpressure. The equipment is tested under less strenuous circumstances (1.5 times the standard pressure) and rarely goes to 4 times the pressure testing.
Difference #3: Markings
Explosion-proof enclosures must comply with the US standards, which focus on class, division, and group. Every marking included serves a purpose. Examples include showcasing the T-class of the equipment and how ignitable the gas can be. At the end of the marking, there is an XP label certifying that the enclosure is explosion-proof.
Conversely, flameproof systems must comply with the requirements of the zone system certification. The EX label highlights the hazardous locations. Meanwhile, the DB marking focuses on flameproofing. There is also the IIC label, indicating the gas group. Lastly, you have the temperature class, ranging from T1 to T6.
Difference #4: Protection covers
Flameproof and explosion-proof enclosures share another similarity. Their casings are either bolted on or firmly attached with threaded covers or joints. However, this is where the similarity ends.
Unlike explosion-proof systems, flameproof equipment contains unique devices that require special tools to remove. As such, flameproof enclosures must be drilled in the factory. Meanwhile, explosion-proof enclosures can be drilled in the field without issues.
Understanding the differences between flameproof and explosion-proof enclosures is essential to ensure you comply with the local safety requirements and guidelines. Thankfully, now that you better understand the distinctions, you will find it easier to identify both enclosures based on their functional factors.
If your business seeks flameproof or explosion-proof enclosures, look no further than BENWEI. We offer a comprehensive selection of products suitable for use in any hazardous area. Our team will gladly assist you in selecting the appropriate equipment for the job.
Contact us today to learn how we can help you.
